Authorities in Nigeria's north-eastern state of Adamawa have ordered all venues planning to screen live coverage of the football World Cup to close.

They say they have received intelligence of planned bomb attacks during the competition, which opens in Brazil on Thursday.

Adamawa is one of the states badly affected by Islamist violence.

Open-air viewing centres - where people pay to watch live football - are popular throughout Nigeria.

"Our action is not to stop Nigerians... watching the World Cup. It is to protect their lives," Brig-Gen Nicholas Rogers was quoted by the AFP agency as saying on Wednesday in Yola, the capital of Adamawa.North-eastern Adamawa state has often been targeted by Boko Haram Islamist militants.

On 1 June at least 14 people were killed in a bomb attack on a bar that was screening a televised football match in Adamawa. No group claimed responsibility for the blast, but Boko Haram were the main suspects.

The state is one of three in Nigeria that have been placed under emergency rule because of the Boko Haram insurgency.